Loop return ? for 02 vw golf

For discussing the modifications needed for diesel vehicles to run with 2 tank veggie oil conversions.

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Loop return ? for 02 vw golf

Postby gary » Tue Aug 26, 2008 3:34 pm

Hih for supply and return..any thoughts on frybrid style "controled loop"?
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Postby SunWizard » Tue Aug 26, 2008 3:40 pm

Yes a looped return is a better way to go, since you heat only the VO you burn and not the entire tank full.

I have no TiH on my return (which is looped and short) and it has been fine down to -10F, the coldest we have had here.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
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loop

Postby gary » Tue Aug 26, 2008 4:03 pm

The pick up and return are inside a cylinder(fossil free fuel design) so heating the tank is not as much an issue as adding a air problem with return loop. Doesnt the tank get heated by the coolant flow anyway?
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Re: loop

Postby SunWizard » Tue Aug 26, 2008 4:19 pm

gary wrote:Doesnt the tank get heated by the coolant flow anyway?
Not much on mine, the 17g tank gets to 100F after a 3 hr. run on a hot day.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
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Re: Loop return ? for 02 vw golf

Postby coachgeo » Tue Aug 26, 2008 7:54 pm

gary wrote:Hih for supply and return..any thoughts on frybrid style "controled loop"?
Can you give us a brief description of a "controlled loop" or maybe a link to a description?

This will avoid assumptions and keep folk better on the same page.
Life; It's all in the Balance

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loop

Postby gary » Tue Aug 26, 2008 10:35 pm

I should direct you to the frybrid sight and look at the diagram section and you will see how it is set up, It requires a third valve and instead of sending unburnt heated fuel back to tank it sends it to a loop to the ip.

Sun, If you did not need extra heat, can you skip the controled loop with the third valve or are there other advantages. My kit did not come with it and the maker is against it as he says you get problems with air and loose power and your purge times are extended..so if I skip it now is it an easy add on or would you do it right from the begining?
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Postby SunWizard » Tue Aug 26, 2008 10:47 pm

I wouldn't skip it, do it from the start. You get more heat at the IP, and heat quicker with it looped.

If your filter is on the vacuum side of the lift pump, then looping gives way less flow through the filter and less chance for air leaks and longer filter life.

Purge isn't extended if you do it right (by using a valve instead of looping all the time), you have full return on purge so its exactly the same time as no loop.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
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Air in looped return, Problem solved

Postby BMW Fan » Tue Aug 26, 2008 11:43 pm

I have tested the pictured device for 1 year and I am amazed.
Air is trapped and automatically released via the vent on top.
No need for a needle valve for part return.
No probs if you run your tank empty.
Air just disappears. I love it.
There are two models available. The one shown in the picture comes with a pre-filter. The second ( not shown ) without.

Image
Image

If interested contact me via klausold@yahoo.de
Sometimes I can get used units.

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looped

Postby gary » Wed Aug 27, 2008 10:05 am

Sun, If your cf filtering and you have a quality kit..no leaks you shouldnt get air in system but if you did a full return is best anyway and the filter should not plug with cf oil and the ip has to work the same anyway, right?

Snce switch over time is based on coolant temp. it should be the same, right?
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"Tiger Loop"

Postby sm7bxd » Fri Aug 29, 2008 10:57 am

Search for "Tiger Loop" or "Tigerloop" and you will know what "BMW Van" want's to say.

/Greaser from Sweden
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Re: looped

Postby SunWizard » Fri Aug 29, 2008 12:25 pm

gary wrote:Sun, If your cf filtering and you have a quality kit..no leaks you shouldnt get air in system but if you did a full return is best anyway and the filter should not plug with cf oil and the ip has to work the same anyway, right?

Snce switch over time is based on coolant temp. it should be the same, right?

No it won't be the same. All filters will plug eventually. With triple the flow through the filter (no loop), it will be too restricted much sooner.

Switchover time is the same, but you get hotter VO to the engine quicker after that switchover with a loop.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
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Posts: 1723
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